THE MIDCONTINENT RIFT SYSTEM IN
IOWA
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MRS SEISMIC DATA |
Reflection seismic data originally collected by Petty-Ray Geophysical Geosource, Inc. were released by Halliburton Geophysical Services, Inc. for investigation by Anderson (1992). These seismic lines are currently available from the Wisconsin Geologic and Natural History Survey in Madison, Wisconsin. Data released included final stack and migrated profiles and profile location maps along seven lines. Three east-west lines (Profiles 7, 12, and 9) completely cross the Iowa Horst and extend over both flanking basins (although Profile 7 displays no useful information below Phanerozoic reflectors). Four north-south or east-west lines (Profiles 8, 11, 10, and 13) extend from on the Iowa Horst over one flanking basin. These profiles displayed 5 or 6 seconds (two-way travel time) of data.
Anderson (1992) interpreted these seismic data utilizing interpretive stick diagrams that were manually constructed from the migrated profiles. Interpretations were constrained by general rift geometry, lithologies, and seismic velocities described by earlier workers in the Lake Superior outcrop belt, Iowa drill data (especially information from the M.G. Eischeid well), magnetic data displayed on maps by Henderson and Vargo (1965) and Zietz and others (1976), the Bouguer Gravity Anomaly Map of Iowa (Anderson, 1981), and by co-modelling with 2-D gravity data along extended seismic profiles.
click to view Bouguer gravity anomaly map of Iowa and surrounding region
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